Well I think Cuthbertson is a better backrower than frontrower...but basically, given we have Zeb and House who will play 70+ minutes each, and then we have Edwards who I'm guessing will probably play 45ish minutes a game in the backrow, and on top of that we have Hilder who will most likely alternate between hooker and backrow, there is only really room for one of Cuthbertson or Costigan in the backrow rotation.
Personally, if it came down to a choice, I would prefer to see Cuthbo in the backrow and Costigan in the front-row.
And if that were the case, Snowden is obviously a certainty to start, and I think Tui would complement him well, and is more of a starter than a benchie. Then having good bench props who don't drop the intensity is a godsend, and he will no doubt get plenty of minutes...it would just be in the middle half of the game.
Costigan has played off the bench plenty over the years, and I think if the saints' pack had stayed fully fit last year he would have been a benchie all year(behind Weyman, Hunt, Smith, Creagh and Young/Scott).
I'm not really fussed on whether Tui or Costigan starts, but I think Tui did enough this season to hold that spot for Round 1 next year...and there's nothing wrong with having some serious respect coming off the bench.
I think the point is more that I hope Bennett uses Costigan as a prop next year.